Mt. Cleveland has had sort of a spontaneous steam eruption and AVO/USGS has upgraded the mountain from condition green to orange.
AVO Full Report
There are no Webicorder accessible siemographs at this mountain, the closest is Okmok's siesmographs. I've been unable to distinguish Okmok's normal backgroud activity from Cleveland's on those webicorders.
From what I can see though, it looks like there was no (or very limited)seismic precursors to this steam vent episode.